The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 1980
Filed:
Feb. 27, 1979
Applicant:
Inventors:
Assignee:
Gutehoffnungshutte Sterkrade Aktiengesellschaft, Oberhausen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
138105 ; 138120 ; 138155 ; 138175 ; 138143 ; 405133 ;
Abstract
A composite underground shaft lining assembly particularly suitable for use as a leak proof water conduit is formed with a plurality of annular concrete sections joined together by interposed layers of flexible joint material forming a composite concrete cylinder, with a composite steel cylinder formed of annular steel sections being arranged about the outer cylindrical surface of the composite concrete cylinder. The annular steel sections of the composite steel cylinder are joined together by spring rings located adjacent the flexible joints formed between the annular concrete sections.